I'm pretty sure the presence of a Golden Age myth to lure Dream Nazis is just a common and effective piece of memetic engineering, not a requirement per se. The practical emphasis on a past golden age varies wildly even within bradhicks' examples; rhetorical emphasis on the Progressive Era within American leftist circles is fairly light, for example, and my understanding is that the neolithic matriarchy hypothesis is pretty badly tarnished by now. Some groups that he doesn't mention, like contemporary musical subcultures or the singularitarian movement that we're all familiar with, don't have one at all -- although nostalgia for an earlier form of the subculture might fill a similar role among oldbies with Dream Nazi leanings.